Exp 2

Electric lab

:Objective knowledge using the power supply and -1 connecting in the circuit ,the breadboard and . digital multimeter .to learn build the simple resistive a network -2 measure the current and the voltage about the -3 . methods ohm's law and the power supply .measure the power to resister -4 to learn use the current divider and the voltage -5 .divider law using the pspice programs and work the -6 .(simulation on it , (drawing the circuit .I-V characteristic of a tow –terminal device-7 :Theory .(ohm's law (V=I*R) and then (I=V/R), (R=V/I-1 .(power (P=I2*R),(P=V2/R) and (P=I*V -2 .( current divider (I1=

-3

) 4- voltage divider percentage error PE =

*100% -5

Vtotal )*

Electric lab

:( Result and digrams (data of table :Table 1 quantity

Nominat ed value v 5.95 v 4.04 A 5.95 mw 35.4

Measure d value v 6.01 v 4.11 A 5.5 30.25m w 20.57m w

Pspice value 5.952 4.048 5.952 35.43

Percenta ge error 1% 1.73% 7.56% 14.5%

24.09

14.3%

Measure d value

Pspice value

4.86 7.14 12 4.86 4.86 23.62

4.95 7.2 11.93 4.9 4.9 24.25

4.857 7.143 12 4.857 4.857 23.59

Percenta ge error % % 1.82 0.84% 0.58% 0.82% 0.82% 2.66%

34.7

35.28

34.695

1.67%

144

142.32

144

1.16%

VR1)DC V) VR2)DC V) IDC mA PR1)DC) mW PR2)DC) mw 24 mW :Table 2

Quantity Nominat ed IR1)dc mA) IR2)dc mA) IR3)dc mA) VR1)dc V) VR2)dc V) PR1)dc) mW PR2)dc) mW PR3)dc) mW :Table 3

Range 21.510.50

V light bulb 0 0 0 0 0

Electric lab

0.5 1.5 2 2.5

0.64 1.73 2.06 2.65

: Calculation .(VR1=I*R =5.95*10-3*1000 =5.95V(from the table 1 PR1=I2 *R=5.952 *10-3*1000 =35.4 mw(from the .(table 1 VR1 =

=

404.76/(404.76*1000)*16.85=4.86 V(from the .(table 2 IR1=

=680/(680+1000)*12= 4.86Ma

: Exercise Verify kirchoff's voltage law for the pervious ?circuit Vtotal=I1*R1+I1*R2 (Vtotal=I(R1+R2 =V1/R1 =V 1 :Exercise ?Verify kirchooff's current law . Nodel A

Electric lab

Itotal + V1/R1+V2/R2=0((v1=v2 (Itotal=V(1/R1+1/R2 =V =I1/R1 =I1

: Experiment circuit circuit 1-1

Circuit 2

Electric lab

:Conclusion exist very different between the current and-1 . voltage divider law .the relation between v , I and R linear-2